交变流型真空高压气淬炉淬火过程数值模拟.docVIP

毕业设计论文 题目： 交变流型真空高压气淬炉 淬火过程数值模拟 单位： 专业： 姓名： 2008年 月 日 摘 要 真空高压气淬技术是二十一世纪最有发展前途的一种真空热处理技术。工件的冷却速度与均温性是真空高压气淬技术的关键指标，也是设计开发高压气淬炉的依据。 本论文针对这一问题，采用数值模拟的方法，着重讨论了气体种类、压力对喷嘴型式真空高压气淬炉淬火性能的影响。利用Gambit软件建立几何模型，再用大型计算流体动力学软件Fluent分别对同一压力，不同气体以及同种气体，不同压力等情况进行计算模拟，从而得到各种工况下淬火工件的温度分布，流场分布，通过对模拟计算结果的分析，找出合理淬火气体和淬火条件，从理论上指导试验工作，减少试验的盲目性，为提高淬火性能提供科学的理论依据。 关键词：真空高压气淬；流场；温度场；数值模拟 Abstract The vacuum high pressure quenching technique is the most developing vacuum heat treating technique in twenty-first center. Cooling speed and average temperature nature of workpieres is the key level of the vacuum high pressure quenching technique, and dependent of design and exploitation of high pressure quenching stove. The articles that aim for this problem, adopting method of numerical simulation, discuss the affect of nature of the vacuum high pressure quenching technique by a kind and pressure of gas. With the development of the computer technique, it can carry out the calculator emulation that annoys the quenching to the vacuum high pressure. This paper uses the Gambit software to establish several models of workpieces and vacuum high pressure gas quenching furnace, then use the large calculation hydrodynamics software Fluent difference to the same pressure, different air and the same race gas, the circumstance of different pressure carries on the calculation simulation, thus can get the temperature field of the quenching workpieces under various work condition, the contour of flow field, the end, finds out the reasonable quenching gases and the quenching conditions, guiding to experiment the work in the theories, reducing the blindness of experiment. keyword：Vacuum high-pressure gas quenching; Flow field; Temperature field; Numerical simulation 目录 摘要 I Abstract II 1 1 1.1 引言 1 1.2 真空高压气淬设备和技术国内外的研究概况 1 1.2.1 国外研究情况 1 1.2.2 国内研究情况 2 1.3 淬火过程计算机模拟 3 1.4 本论文研究的主要内容 3 2 真空高压淬火理论及